7.2 Evidence for evolution

• Biologie
• Middelbare school
• havo
• Leerjaar 3

7.2 Evidence for evolution

Warfarin is a rat poison that was first used in the 1950’s. It was very effective in killing rats that were considered pests. However, nowadays many rat populations are unaffected. These ‘super rats’ are even resistant to large doses of Warfarin.
Explain what happened using the theory of evolution

If a doctor diagnoses Lyme disease in a patient, the doctor prescribes an antibiotic. However, doctors are reluctant to prescribe antibiotics. Frequent use of antibiotics can lead to resistant strains of bacteria. That is why you do not get an antibiotic for every tick bite.

2p Reason how the use of an antibiotic can lead to a resistant strain of bacteria.

Learning goals

How does the comparison of anatomical structures support Darwin’s theory of evolution?

How does the comparison of vertebrate embryos support Darwin’s theory of evolution?

Flying squirrel

Human

Sugar glider

Kangaroo

Direct or indirect

Direct evidence

- Evidence of evolution in which we can see the process at work

- Physiological adaptations.

Indirect evidence --> Most evidence

- Evidence of evolution in which only signs and results are shown, not the process.

- Comparing fossils

Stealing metaphore

These organs are

1. Homologous
2. Analogous
3. Vestigial

Birds and butterflies both have wings. Are these wings homologous or analogous structures?

1. Homologous
2. Analogous

Vestigial structures can best be defined as structures that _____.

1. are functional
2. will become functional
3. are no longer functional
4. No answer is correct.

Homologous

Analagous

A whale has a pelvis, a fish does not (see the pictures below). Explain if whales evolved from fish or from land mammals. Use the following words in your explanation:

land mammals, pelvis, homologous structure, inherited, ancestor

Homework

First four exercises from 7.2